 The burh was provided by law with a mint and royal moneyers and exchangers, with an authorised scale for weights and measures.Mercantile transactions in the burhs or ports, as they were called when their commercial rather than their military importance was accentuated, were placed by law under special legal privileges in order no doubt to secure the king's hold upon his toll.Over the burh or port was set a reeve, a royal officer answerable to the king for his dues from the burh, his rents for lands and houses, his customs on commerce, his share of the profits from judicial fines.